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[–] redditrunbyfascists 0 points 13 points (+13|-0) ago 

This is poor reasoning. I actually studied molecular biology and biochemistry. I have taken the courses on metabolism.

What we are interested in here is metabolism specifically.

The reason caloric restriction works is that it induces the production of protective proteins to help people survive damage that would be induced by starvation.

Fats take in excess calories. This doesn't make them age faster, they just carry the weight as fat.

Fats die younger because of the problems of being fat: heart disease, type 2 diabetes, cancer, joint degeneration, etc.

If changes to metabolism were the key to aging, then the athletes who plow through 6000 kCal/day would drop dead at 40 instead of often living into their 80's/90's.

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[–] c-fox 0 points 18 points (+18|-0) ago  (edited ago)

Fatties look older for two reasons. One is that a fat face has less expression because the muscles are hidden under excess tissue. As people get older skin loses flexibility and sags, and fat on faces also sags, so both older people and fatties have less expressions.
Also we subconsciously associate fatness with older people as young people are generally leaner.